Leggers moving a boat through a tunnel.
https://s3-us-west-1.amazonaws.com/h...gh_tunnel1.jpg
https://s3-us-west-1.amazonaws.com/h...gh_tunnel2.jpg
More: https://www.atlasobscura.com/article...owboat-legging
Previously:
https://www.homemadetools.net/forum/...545#post128137
https://www.homemadetools.net/forum/...031#post120283
https://www.homemadetools.net/forum/...7790#post86258
